Test design tokens build

.github/workflows/test_design_tokens_build.yaml

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+name: Test design tokens build script
+
+on:
+  pull_request:
+    paths:
+      - packages/design-tokens/**
+  workflow_dispatch:
+
+# Cancel any currently running builds to save GitHub Actions hours.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  run-tests:
+    name: Run tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Read .nvmrc
+        run: echo "GITHUB_NVMRC_VERSION=$(cat .nvmrc)" >> $GITHUB_ENV
+        working-directory: ./packages/design-tokens
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ env.GITHUB_NVMRC_VERSION }}
+
+      - name: Install dependencies
+        run: npm install
+        working-directory: ./packages/design-tokens
+
+      - name: Run test suite with npm script
+        run: npm run test
+        working-directory: ./packages/design-tokens

packages/design-tokens/build-output.test.js

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+import { exec } from "child_process";
+import { test } from "node:test";
+import assert from "node:assert";
+
+test("build-output.js should complete without errors", async () => {
+  try {
+    await new Promise((resolve, reject) => {
+      // Execute the build script using Node.js
+      exec("node build-output.js", (error, stdout, stderr) => {
+        // If there was an error, the test should fail
+        if (error) {
+          console.error("Error executing build-output.js:", stderr);
+          return reject(new Error("build-output.js threw an error"));
+        }
+        console.log("build-output.js executed successfully:", stdout);
+        resolve();
+      });
+    });
+    assert.ok(true);
+  } catch (error) {
+    assert.fail(error.message);
+  }
+});